<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      const person = {
        money: 100,
      };
      const jack = {
        // money:200,
        __proto__: person,
      };

      jack.money = 200;
      console.log(person); //100
      console.log(jack); // 200
    </script>
  </body>
</html>
